Accession Number : ADD016478

Title :   Technique for Intracavity Sum Frequency Generation.

Descriptive Note : Patent, Filed 12 Aug 93, patented 26 Jul 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Scheps, Richard

Report Date : 26 Jul 1994

Pagination or Media Count : 16

Abstract : A means for intracavity sum frequency generation is described in which a laser operates simultaneously at two wavelengths. The laser resonator further contains a sum frequency generating nonlinear crystal which is oriented for efficient sum frequency generation of the two fundamental wavelengths. The optical alignment of the resonator provides a region where both fundamental wavelengths are overlapped and are focused. The nonlinear sum frequency generating crystal is placed near this focus in the region where both wavelengths are spatially superimposed, producing the sum frequency of the two wavelengths. Line narrowing of the individual two fundamental wavelengths produces a line narrowed sum frequency generated output. Mirror coatings on all reflective elements are highly reflective for both fundamental wavelengths to produce a high intracavity fluence at both of these frequencies. Sum frequency generation at 459 nm is demonstrated in a non-critically phase matched type II KTP crystal by operating a Ti:sapphire laser simultaneously at 808 nm and 1.064 microns. In order to achieve simultaneous operation at both wavelengths a 1.064 microns signal may be injected into the resonator from an external source, such as a Nd:YAG laser. A doubled Nd:YAG laser may be used to optically excite the Ti:sapphire laser while simultaneously injecting 1.064 microns radiation into the laser cavity.

Descriptors :   *PATENTS, *NONLINEAR OPTICS, *INFRARED RADIATION, *LASER BEAMS, COATINGS, CRYSTALS, FREQUENCY, LASER CAVITIES, LASERS, MIRRORS, OUTPUT, RESONATORS, SIGNALS, YAG LASERS, LIGHT, VISUAL PERCEPTION, SOLID STATE LASERS, CONVERSION, ELECTROMAGNETIC RADIATION, LASER APPLICATIONS

Subject Categories : Information Science
      Optics
      Lasers and Masers
      Crystallography
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE